Bug fixes and small feature updates

[sethsec]

• Bumped version to 1.15.0
• Added the --admin-check-only flag to iam-simulator command
• Added the admin and pmapper checks to the principals command
• Updated adminActionNames check to remove ssm get document and replace with ssm get-parameters which is what i meant to include
• Fixed cape's permissions expansion logic which was causing it basically to not work at all
• Removed AWSSSO-ACCOUNTID entries from cape table as they were only confusing things
• Fixed cape to make edges for cross-account explicit trusts (account A trusts role in account B)
• Fixed External IDs for role trusts not displaying correctly #92
• Fixed bug in cape tui so that it does not crash when looking for files that don't exist. Added better error message
• Fixed a bug in cape that was causing the tui to display paths multiple times because of the use of magenta color code characters.