Add include of stdint.h for int32_t

File addsynth.h was missing an include of <stdint.h> before using int32_t,
and aeolus.h was incorrectly specifying "stdint.h" instead of <stdint.h>
(this was not evident in all build environments).
Set correct libraries for GCC 4.7.2 MinGW build
remove chordeditor
pianoroll updates
fix sequencer access to events
implement selections for simple text editing
Merge pull request #225 from softins/gcc-472-mingw-fix

Set correct libraries for GCC 4.7.2 MinGW build
Merge pull request #220 from softins/fix-stdint-in-aeolus

Add include of stdint.h for int32_t