v0.5.0 - Game Vessels

Graphics:

• Don't draw selected body parent COI
• Changed COI opacity
• Drawing atmosphere
• Drawing orbit impact/COI points
• Draw some parts of orbit in different opacity
• Don't draw ap and pe outside drawn orbit line
• Don't draw points if circle is too small
• Added text fade out
• Made bg_stars movement relative to parent
• Fixed bg_stars wrapping
• Added vessel Ap/Pe markers
• Added vessel marker
• Added selected target vessel/body marker

Physics:

• Separated physics in game to body and vessel physics
• Added surface gravity
• Added atmosphere height
• Calculating impact/COI points
• Made orbit lines calculated per vessel
• Changed atmosphere density calculation
• Hyperbolic vessel orbit
• Updated bodies curve calculation
• Calculate atmosphere circle intersection with orbit
• Detect entering/leaving atmosphere in next iteration
• Detect impact in next iteration
• relative inserting position and velocity

Saves:

• Load/save vessels from save file
• Added parts directory
• Added vessel scale to map config
• Added initial vessel/part sprite
• Added "game_data" section to game save
• Moved name, date and time to game_data
• Added selected vessel to game_data
• Changed save time from seconds to ticks
• Added atmosphere variables to savefile and editor
• Fixed game save name
• Time is not saved in editor
• Added auto-correct when reading positive semi-major for hyperbola from save

Selecting:

• Added selecting for vessels with double click
• Added selecting vessel as target with single click
• Added default target to be active vessels parent
• Selected vessel orbit is blue
• Switching vessel focuses follow offset to it

Follow:

• Follow modes: disabled, active vessel, orbited body
• Print follow mode message
• Added follow with offset
• Added double click on body in list focuses to it

UI:

• Removed zoom from top UI
• Removed move position from top UI
• Removed toggle grid key
• Added disabled to grid modes
• Added warp button to top UI that cycles or stops warp
• Added follow button to top UI that cycles follow modes
• Added grid modes to top UI
• Added days and years to time (0y, 0d, 00:00:00)
• Added prioritizing vessel when selecting target
• Added time warp messages
• Added debug physics time percentage to top UI
• Added physical warp to top UI
• Added tab when typing value switch to next
• Fixed while inserting - wrong text in menus
• Fixed menu enter while deleting
• Fixed menu enter while  new game
• Fixed menu update selected item when deleting
• Changed game home button focuses active vessel

Culling:

• Added optional culling for vessels
• Added optional culling for bodies

Warp system:

• Added physical warp (x2, x4, x8)
• When vessel will enter atmosphere or collide with body - switch to physical
• When  vessel will leave atmosphere - switch to regular x1
• Support for multiple vessels - all vessels must be out of atmosphere to allow regular warp
• Warp switching messages

Maps:

• Added atmosphere to builtin map
• Added example game with vessels