Work on layout / style / graphics

...in/java/de/hhu/ba/yoshikoWrapper/core/GraphicsLoader.java

...de/hhu/ba/yoshikoWrapper/gui/ComfortCollapsiblePanel.java

...main/java/de/hhu/ba/yoshikoWrapper/gui/EditCostPanel.java

...n/java/de/hhu/ba/yoshikoWrapper/gui/LanguageSwitcher.java

...a/de/hhu/ba/yoshikoWrapper/gui/LanguageSwitcherPanel.java

...ain/java/de/hhu/ba/yoshikoWrapper/gui/LibStatusPanel.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/LibraryPanel.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/MainPanel.java

...java/de/hhu/ba/yoshikoWrapper/gui/OperationModePanel.java

...a/de/hhu/ba/yoshikoWrapper/gui/ReductionRulesChooser.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/ResultPanel.java

...in/java/de/hhu/ba/yoshikoWrapper/gui/TimeLimitSetter.java

...main/java/de/hhu/ba/yoshikoWrapper/gui/YoshikoHeader.java

src/main/java/de/hhu/ba/yoshikoWrapper/gui/package-info.java

src/main/resources/YoshikoStrings.properties

src/main/resources/graphics/YoshikoAlphaLogo.png

src/main/resources/graphics/YoshikoAlphaText.png

src/main/resources/graphics/YoshikoLogo.png

src/main/resources/graphics/YoshikoSolved.png

src/main/resources/graphics/YoshikoText.png