Minor additions and fixes

Additions:

• Add "Sequence" macro action.
  
  This new action will allow you to advance through a list of other macros' actions, advancing to the next item in the list each time this action type is performed.
  An example can be found here.
• Add macro action to stop other macros to the "Macro" action type.
  
• Add option to also check for configured volume level to the "Audio" condition type.

Fixes:

• Fix unexpectedly returning true for hotkey condition.
  The condition would return true after unpausing a macro, if a configured hotkey was pressed during the time the macro was paused.
• Fix dock location and size not saving correctly.
• Fix potential crashes reported with the recent beta releases of OBS.

Notes:

• The plugin folder structure has been slightly changed to move any dependencies the plugin ships with into a separate folder "adv-ss-plugins".
  This should make it easier if you would need to manually uninstall the plugin.