feat(overrides): Add additional prefix/suffix support

Allows a higher-level prefixes and suffixes by allowing it directly on
`@theme-*` options, which are what are set directly against Tmux's
options.

These are the prefix/suffix options added:

- `@theme-status-left-prefix`
- `@theme-status-left-suffix`
- `@theme-status-right-prefix`
- `@theme-status-right-suffix`
- `@theme-window-status-current-prefix`
- `@theme-window-status-current-suffix`
- `@theme-window-status-prefix`
- `@theme-window-status-suffix`

As they are applied on the highest level, it means they work on ALL
themes, including the `default` theme.

The `@themepack-*` prefix/suffix options still work too, but only for
themes that uses them and have three separate text areas on the left and
right status.

src/powerline/default/_base.tmuxsh

@@ -3,6 +3,6 @@
 #= include "powerline/_powerline-options"
 
 #= include "powerline/_theme-options"
-#= include "powerline/_window-status-default"
+#= include "powerline/_theme-options-default"
 
 #= include "_apply"

src/powerline/default/blue.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Blue - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/blue"

src/powerline/default/cyan.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Cyan - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/cyan"

src/powerline/default/gray.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Gray - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/gray"

src/powerline/default/green.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Green - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/green"

src/powerline/default/magenta.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Magenta - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/magenta"

src/powerline/default/orange.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Orange - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/orange"

src/powerline/default/purple.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Purple - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/purple"

src/powerline/default/red.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Red - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/red"

src/powerline/default/yellow.tmuxtheme

@@ -2,7 +2,7 @@
 # Powerline Yellow - Tmux Themepack
 #= include "powerline/_info"
 
-#= include "powerline/_formats"
+#= include "powerline/_themepack-options"
 
 # Powerline color options
 #= include "powerline/_colors/yellow"