* added support for reading borland c++ builder 6 projects
* add: fetch sysdefines from project
add: start providing bcb6 predefines (WIP)
* configure all the internal defines for BCB6
* make sure define strings don't start with ';'
* improvements on bwoesters BCB6 project support
- improved `*.bpr` XML handling by reducing the number of loops
- added `const` where aplicable
- optimized compiler argument parser performance
- reformatted code with provided astyle config
* - undo looping (keep it the same as the other implementations)
- keep parsing of cflags simple and separate from the synonym cleanup (no need for micro optimization in this place)
- move input validation to FileSettings::setDefines
- re-run astyle
* use [] instead of at() when comparing characters
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