v0.2.7: install reliability + theming fixes

everything that's changed since 0.2.6. big thanks to all the contributors below.

installer

• resolve a batch of installer / palette / template / splash bugs (#109, @Xerrion)
• fix global theme not appearing in KDE settings on plasma 6 (#111, @Xerrion)
• non-interactive auto mode: ./install.sh <flavour> <accent> <windowdec> auto (#68, @FreddyFunk)
• theme-apply confirmation prompt (#113, @mochacinno-dev)
• cursors bumped to scalable v2.0.0 (#92, @Koba-gh)
• borderless windows actually apply on install (#120, @soleynn)

window decorations

• restore thin/no borders (#118, @soleynn)
• fix corners bleeding blur past the rounded edge / korners (#122, @soleynn)
• accent color on decoration hover (#97, @Koye64)
• consistent padding for classic window buttons (#103, @luisrslz)
• fix overflow in the modern aurorae theme (#61, @Ankh64)

colors

• selection-bar text readable on every accent (#119, @soleynn)
• selection text stays readable when its panel is unfocused (#121, @soleynn)