Clear caches every time we reset a subtitle
New Style edit dialog [PART 1] Change to use CPropertySheet for default style editing
New Style edit dialog [PART 2] Add INT_CUR_STYLES_COUNT/BIN2_CUR_STYLES for the dialog to retrieve styles of current selected subtitle
New Style edit dialog [PART 3] Add INT_CUR_STYLES_COUNT/BIN2_CUR_STYLES for the dialog to retrieve styles of current selected subtitle
New Style edit dialog [PART 4] Add style edit pages for styles in current selected subtitle
Add a simple heuristic rule in ChangeUnknownStylesToDefault. Should improve loading speed of big files a bit