Previously, the LCD code needed to be aware of each synthesizer to know
how to draw their respective displays, which wasn't very maintainable.
Introduce a UI class where generic drawing utility functions and
"system" drawing code can be implemented, and move synth-specific
drawing to the synth classes themselves. This simplifies the LCD/OLED
drivers to just being interfaces to the hardware.
Also introduce a "MIDI monitor" class which tracks the state of all MIDI
activity per-synth for level meter drawing purposes. This ensures we
never miss a note; previously we were simply polling each synth engine
for its note velocities per LCD update, which was prone to missing fast
notes and also didn't account for channel volume or expression pedal.
Finally, enable support for 16-character wide displays (closes#58).
This commit introduces the notion of "effects profiles", with
reverb/chorus settings that can be set on a per-SoundFont basis.
The configuration file has been updated with an example of applying a
profile to the GeneralUser GS SoundFont.
This commit adds a simple physical control system with two schemes:
* simple_buttons: 4-button scheme
* simple_encoder: 2-button scheme + rotary encoder (with button)
Refactor synth code to decouple it from the audio driver and instead use
the drivers' Write() methods to insert rendered audio into a queue from
CPU core 2.
Rename enums, functions parameters and class member variables so that
they match the Circle coding style more closely.
Replace /* ... */ comments with // comments.
Fixup some indentation issues/trailing whitespace.
Remove undefined functions and unused #defines.
Reduce code duplication significantly by employing macros and templates
for parsing strings into enums.
Increase efficiency by adding {BEGIN|END}_SECTION markers in config.def
so that we can avoid unnecessary calls to strcmp() with the section name.
Introduce a ROM manager that scans a 'roms' directory on startup for all
valid ROMs that mt32emu supports.
If none are found in this directory, fall back on searching for
MT32_{CONTROL|PCM}.ROM in the root of the SD card as before.
Add a custom SysEx command that allows the user to switch ROM sets on
the fly.
Add a new config file option for setting the default ROM set.
Closes#18.
