Replaces MATLAB's smart indent functionality with self written code #75.

[mriesch-tum]

Please note that this is an experimental patch set with several known flaws:

• MATLAB version >= R2016b is required (mostly for string manipulation operations)
• It is assumed that keywords such as if, for, etc. are separated from the rest of the code with white space. For example, if (a < b) works, if(a <b) does not.

This first experimental version should serve as basis for issue #75.

[mriesch-tum]

Added two fixes:

• Comments at the end of the line were mistaken for code. Assuming that EOL comments begin with a percent sign FOLLOWED BY WHITESPACE, the indenter works correct. Without the whitespace it will still behave incorrectly.

• Class methods were mistaken for nested function. This could be fixed.

[davidvarga]

Thanks for the effort!
Accepted the PR as the new experimental indenter is completely detached.
Could be integrated nicer if the Indenter would be abstracted into an interface with two implementation MatlabEditorIndenter and StandaloneIndenter, with some interface methods. Then the indenter to use could be set through the settings of MBeauty -> the new static method could be removed.