HalfCraft 0.2.0

HalfCraft 0.2.0, built from 650e171.

Changes since v0.1.0:

• refactor: server.dll looks up client.dll's input push in one place (650e171)
• feat: mobs and dropped items off the player's water grid get water probes too, so they swim and float in far canals (89be5ff)
• feat: the gravity gun tears minecraft's blocks out as physics cubes that turn back into blocks where they come to rest, or drop as items without room (6034328)
• feat: a new game from the menu starts a playthrough that clears each map's minecraft builds the first time it enters it, and heals and feeds the player (faa119f)
• feat: half-life's blasts break minecraft's blocks the way tnt does, and its bullets break glass, panes and ice (18709da)