Fix GT3 Enable Code.

Fix loading database when adding a new game after an existing one.

Fix background clear.

Jump to top/bottom of value map list.

Fix #29.

Update bug_report.md

Update issue templates

Merge pull request #25 from luisdallos/multi_level_pointer_write_support

engine: Implement multi-level pointer write support.

Display total number of cheats in about page.

Reset dirty flag after saving.

Reformat section headers.

Fix creating list of saves.

Ignore "Your System Configuration" saves.

Cleanup save manager.