Switch from Remark to Category DB

Code changes shall be handled through _BIL_ANDROID compiler switch durind development.

bilcore:
  - Convert TRemark (string) to TCategory (index) -> DONE
  - Category List to be saved/load in update file format; item category shall be set as an index -> DONE

bilancio UI:
  - rework RemarkForm to TOperationForm -> DONE
  - backup and remove remark form and sources (wxfremark.* and fremark.*) --> DONE
  - add UI to edit categories -> DONE
  - category to be added in GainExpense.cpp --> DONE
  - category dropdown list to be selected through key presses --> DONE

bilconvert:
  - rename LoadFromFile LoadFromFile0301 (in bilconvert) -> DONE
  - rename SaveToFile SaveToFile301 (in bilconvert) -> DONE

  - add sources in branch
      - cb/bilconvert.cpb --> DONE
      - src/bilancio/ui/wxeditcategories --> DONE
      - src/bilancio/ui/editcategories --> DONE

makefile linux:
  - update version --> DONE
  - add CONVERTNAME --> DONE
  - add *categor* in OBJECTS_APP -->DONE
  - add OBJECTS_CONV --> DONE
  - add $(CONVERTNAME) in recipe 'all' --> DONE
  - add '$(CONVERTNAME)' recipe --> DONE
  - remove -D_BIL_ANDROID from '$(OBJDIR)%.o' recipe
  - add $(OBJECTS_CONV): CFLAGS := -Wall -D__BILCONVERT_BIN__ -O2 (also debug version) --> DONE
  - add bilconvert folder in 'createbuildfolders' recipe --> DONE
  - install/uninstall bilconvert --> DONE

makefile msw:
  - update version --> DONE
  - add CONVERTNAME --> DONE
  - add *categor* in OBJECTS_APP -_>DONE
  - add OBJECTS_CONV --> DONE
  - add $(CONVERTNAME) in recipe 'all' --> DONE
  - add '$(CONVERTNAME)' recipe --> DONE
  - remove -D_BIL_ANDROID from '$(OBJDIR)%.o' recipe
  - add $(OBJECTS_CONV): CFLAGS := -Wall -D__BILCONVERT_BIN__ -O2 (aldo debug version) --> DONE
  - add bilconver folder in 'createbuildfolders' recipe --> DONE
  - install/uninstall bilconvert

translations:
  - 'remark' occurrences and related translations to be changed to 'category' --> DONE
  - remove wxfremark.cpp from files.txt --> DONE
  - translate wxfeditcategories strings -->DONE
  - translate edicategories strings -->DONE
  - remove wxfremark.cpp strings -->DONE
  - bilconvert --> DONE
  - MainFrame -> Operations -> Remark -->DONE
  - MainFrame -> Operations -> Edit categories -->DONE
  - bil30core.cpp line #461 -->DONE
  - bil30core.cpp line #874 -->DONE
  - translate "credit" e "debit" strings (test case: remove partial credit/debt w/ value greater than the total credit/debt) --> DONE

try building MSW version --> IN PROGRESS
align makefile.win to Makefile --> IN PROGRESS

Guide:
  - add description of category list

Once completed:
  - the switch _BIL_ANDROID shall be removed from all source files (the branch revision 176 is the last working with this switch)
  - the build target Debug_GTK shall be replaced by Debug_GTK_Android
  - set trunk branch to private

Work items:
bilcore - Convert TRemark (string) to TCategory (index): DONE
bilcore - Category List to be saved/load in update file format; item category shall be set as an index: DONE
bilancio UI - rework RemarkForm to TOperationForm: DONE
bilancio UI - backup and remove remark form and sources (wxfremark.* and fremark.*): DONE
bilancio UI - add UI to edit categories: DONE
bilancio UI - category to be added in GainExpense.cpp: DONE
bilancio UI - category dropdown list to be selected through key presses: DONE
bilconvert - to be implemented: DONE
bilconvert - rename LoadFromFile LoadFromFile0301 (in bilconvert): DONE
bilconvert - rename SaveToFile SaveToFile301 (in bilconvert): DONE
makefile - install/uninstall in makefile: DONE
branch sources - cb/bilconver.cpb: DONE
branch sources - src/editcategories.*: DONE
branch sources - src/wxeditcategories.*: DONE
translations - 'remark' occurrences and related translations to be changed to 'category': DONE
translations - remove wxfremark.cpp from files.txt: DONE
translations - remove wxfremark.cpp strings: DONE
Once completed - the switch _BIL_ANDROID shall be removed from all source files: DONE
Once completed - the build target Debug_GTK shall be replaced by Debug_GTK_Android: DONE