ide/project; compiler: Fixed IDE hangs on numerous syntax errors
- Added GetLinePeek() to DualPipe class
- Modified ProcessBuildPipeOutput() to make use of GetLinePeek()
- Calling fflush() on stdout from compiler
- Did not apply to other IDE/Project locations where GetLine() is used with pipes
 (ProcessCleanPipeOutput(), Build() when eC_Debug is on, ProcessPipeOutputRaw() when justPrint or isVC is on)