Themes switching change

- When new theme is loaded, first Default theme is applied (to reset
internal qproperty-* styles) - no need to include reset in all themes
anymore
- use of shorter variable $theme-dir which is equivalent of
  $themes-dir/<ThemeName>
Themes switching change

- When new theme is loaded, first Default theme is applied (to reset
internal qproperty-* styles) - no need to include reset in all themes
anymore
- use of shorter variable $theme-dir which is equivalent of
  $themes-dir/<ThemeName>
Merge branch 'master' of https://github.com/zeewolfik/HyperStake
Merge pull request #38 from zeewolfik/master

Themes switching improvements