Feature/bma/text styles and colors

[bmarty]

Changes

• use colors defined in https://www.figma.com/file/X4XTH9iS2KGJ2wFKDqkyed/Compound?node-id=557%3A0
• remove unused resources and code (ex: PercentView)
• split some resource files into smaller file
• rework the theme files
• ensure material theme is used everywhere in the theme and in the layout
• add default style for some views in the theme (ex: Toolbar, etc.)
• add some debug screen in the debug menu, to test the themes and the button style
• rework the button style to use materialThemeOverlay attribute
• custom tint icon for menu management has been removed
• comment with riotx has been updated

Main change for developers

• Read migration guide: https://github.com/vector-im/element-android/pull/3459/files#diff-f0e52729d5e4f6eccbcf72246807aa34ed19c4ef5625ca669df998cd1022874b
• Use MaterialAlertDialogBuilder instead of AlertDialog.Builder
• some Epoxy Item included a divider. This has been removed. Use a dividerItem or bottomSheetDividerItem Epoxy items to add a divider
• RecyclerView.configureWith now take a divider drawable instead of a divider color

Remaining work

• Cleanup some vector drawables and ensure a tint is always used instead of hard coded color.