added GoToGameButton
made start button in menu attribute instead of local variable
added resume button to main menu
added setVisible() to ClickableText
added activation to clickable text that controls some subclasses
added resume button to menu
added methods to make menu start or pause menu
added getMenu() to TowerDefense
added ability to pause the game
fixed text field color
cleanup
fixed pressing buttons in menu activating in game later
removed some dummy scores + fixed game crashing with < 10 saved scores
fixed resume game button being clicked on first pause of the game
fixed crash and added Title for main menu

fixed crash when writing score < 10 entries
"VIRUS DEFENSE" title for main menu and "GAME PAUSED" for pause menu
fixed menu going backt to main menu after winning game
game now resumes to main menu on win, too
Merge branch 'feature/issue/#17' into develop