Application:
- Implement "Save" menu

Functionality:
- Context menu in symbol navigator
- Delete symbols before/after selected
- Shift all symbols on code line (change symbol codes)
- Specify starting code (extends the shift)
- "Only numbers" range in the New dialog
- "Specify range" in the New dialog
- "Single frame", "only numbers" and "specify range" as radio buttons
- Button to Clear/Fill a block
- Undo/Redo
- Image import from a file
- Import from a text array
- Copy-paste to a symbol with different size
- Rectangle selection to mass-paint, shift and mirror pixels
- Change height of variable width fonts with ability to choose which side to add pixels to
- Make it possible to have zero width chars in VarWidth fonts
- "Packed" fonts export

Bugs:
- Every char changes its width to default on VarWidth font height change!