Added support for custom values for filtering checkboxes

[gabriel-bolbotina]

Implemented support in filter controller and in MM filter bool input for custom values for checkboxes.
Right now in QGIS a checkbox can be:

• boolean, default setting which has True and False
• string, for text values and customisable ones
• integers, using 0 or 1.

[github-actions]

Coverage Report for CI Build 24145764706

Coverage increased (+0.2%) to 57.766%

Details

• Coverage increased (+0.2%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 160 coverage regressions across 2 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

160 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
mm/app/filtercontroller.cpp	159	0.59%
mm/app/position/providers/simulatedpositionprovider.cpp	1	91.67%

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Coverage Stats

Relevant Lines:	15201
Covered Lines:	8781
Line Coverage:	57.77%
Coverage Strength:	99.98 hits per line

---

💛 - Coveralls

[github-actions]

📦 Build Artifacts Ready

OS	Status	Build	Info	Workflow run
macOS Build	📬	Mergin Maps 66581 dmg	Expires: 07/07/2026	#6658
linux Build	📬	Mergin Maps 66691 x86_64	Expires: 07/07/2026	#6669
win64 Build	📬	Mergin Maps 58531 win64	Expires: 07/07/2026	#5853
Android Build	📬	Mergin Maps 797051 APK [arm64-v8a]	Expires: 07/07/2026	#7970
	📬	Mergin Maps 797051 APK [arm64-v8a]	Google Play Store	#7970
Android Build	📬	Mergin Maps 797011 APK [armeabi-v7a]	Expires: 07/07/2026	#7970
	📬	Mergin Maps 797011 APK [armeabi-v7a]	Google Play Store	#7970
iOS Build	📬		Build number: 26.04.890911	#8909

[tomasMizera]