Fixed add function for KeyMapNode

Allowed an existing KeyMapNode without a command to have a command

When adding a command, if the corresponding string exists but doesn't have a
command, then its cmd and hasCmd variables are updated

Fixed cmake installer

Fixed cmake installer by creating a directory for the the config template.

Initial Release

Initial release with minimal required features.

Current features:

• Load shortcut map and master key bind from config file
• User can specify config file location
• Log errors to system log
• Grab keyboard when master key bind is called
• Release keyboard when no more key input is available