Update 0.4 + next features

Changelog:

• Settings menu added into main menu game window
• Added a volume slider into settings menu
• Added a game resolution dropdown menu into settings menu
• Added a fullscreen option into settings menu
• Added the changelog in the about menu
• Added a "send feedback" window that will mail your feedback into my
  inbox (it may lag a couple of seconds before sending the mail)
• Added a bar in the crystal mining section of the game to increase the
  manual mining output over time, to a maximum cap of five crystals per hit.
• Increased the required marine quota to balance game economy
• Revamped the victory screen with an option to get back to the menu instead of quitting

Next features (coming with next 1.0 Major Update):

- Keymapping
- Multiple levels
- AI opponent (Zerg or Protoss or enemy Terran)
- Flavor text from the AI
- Game Overhaul