Add includes parameter to fix warnings when generating a translation file.

When generating a translation file with e.g. "make de.ts" more than 150 warnings like the following appeared.
/home/daniel/Lmms/src/tracks/Pattern.cpp:642: Qualifying with unknown namespace/class ::PatternView
/home/daniel/Lmms/src/tracks/Pattern.cpp:701: Qualifying with unknown namespace/class ::PatternView
/home/daniel/Lmms/src/tracks/AutomationTrack.cpp:40: Qualifying with unknown namespace/class ::AutomationTrack
...
Move definitions to fix 26 errors which adds new translatable strings

Fixes the following 26 errors when generating a translation file with e.g. "make de.ts":
/home/daniel/Lmms/plugins/monstro/Monstro.h:69: tr() cannot be called without context
/home/daniel/Lmms/plugins/monstro/Monstro.h:70: tr() cannot be called without context
...
/home/daniel/Lmms/plugins/monstro/Monstro.h:96: tr() cannot be called without context
/home/daniel/Lmms/plugins/monstro/Monstro.h:97: tr() cannot be called without context
Add missing Q_OBJECT macros in header files

Fixes 20 warnings similar to the following ones when generating a translation file with e.g. "make de.ts":
/home/daniel/Lmms/src/tracks/AutomationTrack.cpp:40: Class 'AutomationTrack' lacks Q_OBJECT macro
/home/daniel/Lmms/src/core/FxMixer.cpp:41: Class 'FxRoute' lacks Q_OBJECT macro
/home/daniel/Lmms/src/core/FxMixer.cpp:554: Class 'FxMixer' lacks Q_OBJECT macro
/home/daniel/Lmms/src/gui/widgets/MeterDialog.cpp:52: Class 'MeterDialog' lacks Q_OBJECT macro
...
Revert "Add missing Q_OBJECT macros in header files"

This reverts commit 337003a3b0fc8c43e44d42fbd5cf394a983ce055.
Seams to break Windows builds.
Add missing Q_OBJECT macros in header files

Fixes 20 warnings similar to the following ones when generating a translation file with e.g. "make de.ts":
/home/daniel/Lmms/src/tracks/AutomationTrack.cpp:40: Class 'AutomationTrack' lacks Q_OBJECT macro
/home/daniel/Lmms/src/core/FxMixer.cpp:41: Class 'FxRoute' lacks Q_OBJECT macro
/home/daniel/Lmms/src/core/FxMixer.cpp:554: Class 'FxMixer' lacks Q_OBJECT macro
/home/daniel/Lmms/src/gui/widgets/MeterDialog.cpp:52: Class 'MeterDialog' lacks Q_OBJECT macro
...
Fix moc_file inclusion in cmake files

This should fix the Windows builds
About dialog: Move involved tab into .ui file
Add more missing Q_OBJECT macros
Update German translation
Also scan headers for translatable strings
Move Monstro macros back to headers
Merge pull request #1327 from DanWin/stable-1.1

Fix most warnings and errors when generating translation files