v1.6.3 - bring back float module

Brought back the float module that was removed in v1.6.0. Please keep in mind, it will crash if running from cartridge!

v1.6.2 - minor improvements

• micro optimizations
• "see" improvements
• removed "sei" and "cli"
• flash screen when reading from disk
• moved ">body" to compat
• added methods for reading jiffy clock in timer.fs
• improved stack underflow detection
• changed save-forth syntax from s" foo" save-forth to save-forth foo
• bugfix: save-forth now works from cartridge (thx corey minter)
• bugfix: ar/yr/xr docs (thx corey minter)

v1.6.1 - minor improvements

2016-02-10: v1.6.1

• forth: evaluate failed for strings that ended at page boundary
• forth: print error in case include fails
• forth: space optimize of
• forth: moved 2over, 2swap to compat
• cart: made cartridge boot faster
• cart: use Simons' Basic cart type to make $a000-$bfff RAM
• editor: starting without filename now doesn't read from disk
• editor: :w on unnamed buffer now prints "no filename"

v1.6.0 - cartridge support!

• forth: now available as a 16 kB cartridge image. the cartridge
  has the same functionality as the disk version, but boots faster.
• forth: removed gfx from standard modules
• forth: dropped all usage of BASIC (including float module)
• forth: moved rarely used words to compat module
• asm: renamed zptmp zptmp2 zptmp3 => w w2 w3
• asm: renamed sp0 sp1 => lsb msb
• gfx: moved bitmap graphics area from $8c00-$8fff, $a000-$bfff
  to $cc00-$cfff, $e000-$ffff
• doc: expanded assembler documentation
• editor: removed fg

v1.5.4 - fix vi save problems

• bugfix: vi :w didn't work with filenames longer than 6 characters
• bugfix: vi :w! captured control characters in filename
• bugfix: changed vi :w to avoid 1541 bugs
• vi: improved feedback when saving
• vi: stop using backup files
• forth: added require, required
• doc: documented assembler, sid

v1.5.3 - fix evaluate/vi f7

Various bug fixes for evaluate/vi f7.

v1.5.2 - bugfix & improvements

• bugfix: find now handles the empty string correctly
• bugfix: editor didn't work correctly with big files (over $1000 bytes)
• forth: the interpreter now prints "ok" after interpreting
• forth: abort" now inverts the text
• editor: open files with 'vi file' instead of 's" file" vi'
• editor: no longer possible to join lines by shift+backspace
  in insert mode

v1.5.1 - bugfix & improvements

2016-01-10: v1.5.1 - bugfix & improvements

• bugfix: evaluate and vi F7 didn't work for multi-line buffers
• bugfix: see did not work on the latest word
• bugfix: e.g. 'A' was parsed as 'a'
• bugfix: case insensitivity did not work for z/Z
• editor: use fg to bring back editor instead of RESTORE
• disk: added include (e.g. "include gfx" loads gfx module)
• disk: added device ( device# -- ) to switch active device
• disk: renamed load => included
• forth: added marker
• forth: made dump work in decimal mode
• forth: made .( immediate
• forth: removed no-tce
• forth: bring back modules

v1.5.0 - Forth 2012 core standard compliant

2016-01-04: v1.5.0 - Forth 2012 core standard compliant!

• forth: made +loop work according to standard
• forth: added support for #, $, %, char parsing. e.g. #123, $d020, %1001001, 'z'
• forth: ' now aborts if it does not find a word
• forth: made "type" disable c64 quote mode (fixes "words")
• forth: state ( -- flag ) changed to state ( -- addr )
• forth: added count, >body, <#, #>, hold, sign, #, #s, >number, move, accept
• forth: removed hide, hide-to, hidden, forget, scratch, cmove, cmove>
• forth: fixed yet another tail call elimination crash
• forth: made while/repeat implementation conform to standard
• forth: made word conform to standard
• forth: made "immediate", "no-tce" non-immediate
• forth: made sure immediate does not toggle

Thanks to polluks for suggestions!

v1.4.6

2015-12-30: v1.4.6

• bugfix: disabled tail call elimination for literal ['] [char]
  to avoid some crashes
• bugfix: <, rshift, u. did not support negative numbers
• forth: made word finding + numbers case insensitive
• forth: renamed char to getc, and added a new char that works
  according to the Forth 2012 standard.
• forth: added abort, abort", 2@, 2!, char+, chars, align, aligned
• forth: key, key? now work only with keyboard
• forth: made quit reset input and fall back to keyboard
• forth: fill ( ch addr len ) changed to fill ( addr len ch )
• forth: allot ( -- n ) changed to allot ( -- )
• forth: made base a variable instead of a value
• forth: changed variable; data field is now after code field

Thanks to Christian Johansson for suggestions!