fix: Clear SoundFonts on SamplePool reset

[ax0]

Description

This PR clears loaded SoundFonts on SoundFontManager (thus also SamplePool) reset. This fixes a bug where loading SoundFont-containing projects successively results in unloaded SoundFonts once the maximum number of loaded SoundFonts (set to 3) is exhausted, e.g. loading a project containing one SoundFont four times in a row results in an unloaded SoundFont in the last instance. I've also added logs for SoundFont loads and allowed the aforementioned limit to be specified at compile-time (documented in the reference manual).

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

The workflow described above involving projects with SoundFonts was checked with the proposed changes and resulted in loaded SoundFonts in all cases. The preprocessor directive was also tested with projects containing more than 3 SoundFonts.

Test Configuration:

• Hardware: Intel x64, Anbernic RG28XX.
• Test steps:
  1. Load a project containing a SoundFont and play it, confirming playback of the SoundFont sample(s).
  2. Repeat Step 1 as many times as necessary to confirm that occupied SoundFont slots do not persist across project loads.

Checklist:

• I have performed a self-review of my code
• I have commented particularly in hard-to-understand areas
• I have updated CHANGELOG
• I have updated docs/wiki/What-is-LittlePiggyTracker.md reflecting my changes
• I have version bumped in sources/Application/Model/Project.h
• My changes generate no new warnings (build without your change then apply your change to check this)

[djdiskmachine]

Hey thanks a lot for the fix!
I barely used Soundfonts, you're saying that re-loading the same project with soundfonts multiple times would eventually cause a crash?

[ax0]

It wouldn't cause a crash, but it would result in SoundFonts failing to load on any subsequent projects unless LittleGPTracker is restarted. More concretely, loading the same project (containing one SoundFont) four times silently fails to load the SoundFonts the fourth time (and in any subsequently loaded projects): The project appears to load properly, but on playback the SoundFont samples are missing. This is because the array of loaded SoundFonts isn't cleared when a new project is loaded, which results in this branch never being executed when it is full:

LittleGPTracker/sources/Externals/Soundfont/ENAB.CPP

Line 101 in 3f9908f

if(bankNodes[i].pHydra == NULL ) { // use first we find...

[djdiskmachine]

Hey I appreciate you putting time into this, I'm sorry but I haven't had the time to test it out yet.
I'd really like to improve on the soundfont stuff, it'd be really nice to be able to browse import and possibly even export soundfonts in the future so I'm really thankful you did this ^_^