Notable changes:
 2018-12-22 3941b405 actionless chore(packaging: arch): use resvg-git instead of inkscape
 2018-12-22 eb65b761 actionless fix(plugin_loader): exception formatting if exception args are not all strings
 2018-12-22 9fdc5012 actionless feat(main, preview): reduce extra paddings in UI
 2018-12-22 8b80fae4 actionless refactor(plugins: materia): rename TXT_BG to MATERIA_VIEW, BTN_BG to MATERIA_SURFACE, GNOME_SHELL_PANEL_OPACITY to MATERIA_PANEL_OPACITY (and migrate old values on runtime)
 2018-12-21 1af5ba70 actionless refactor: rename MENU_BG to HDR_BG and MENU_FG to HDR_FG (and migrate old values on runtime)
 2018-12-21 b4c3f955 actionless chore(plugins: oomox): update submodule (viewport fix again :))
 2018-12-21 2b0f79dc actionless chore(plugins: materia): update submodule (button color fix)
 2018-12-19 f7421916 actionless feat(plugins: materia): revamp theme options
 2018-12-19 dd3c784b actionless chore(plugins: materia): update to the latest version (optional resvg usage)
 2018-12-13 05dc8bab actionless fix(makefile): explicitly set a+x for executables
 2018-12-10 9d02e1db actionless chore(plugins: oomox): update submodule (cinnamon theme update)
 2018-12-09 3b7279f2 actionless chore(colors: retro): update icons and terminal palettes for some of the themes
 2018-12-09 440459d1 actionless feat(plugins: icons): add new Numix icons plugin