2.0.0-alpha8

This is the eighth alpha release of our 2.0.0 "dev builds".

The old stable v0.18.2-rc1 release still has more optimized output for Q1 and faster/less memory use for
qbsp/light, but we're working on regressions and welcome feedback as we work towards a stable 2.0.0 build.

Changes

• light: invalid "delay" settings are now a warning rather than a fatal error
• qbsp: q2: write out true leaf contents even if CONTENTS_SOLID is set. Previous
  behaviour (including original qbsp3 compiler) was that CONTENTS_SOLID would
  clear any other set contents bits in leafs (but not in brushes.) (#420)

Features

• lightpreview: show leaf contents in status bar
• light: LIGHTING_E5BGR9 + HDR .lit support (from @dsvensson and @Shpoike)

Bug fixes

• light: fix "mangle" on _sun 1 entities (#266)
• light: fix sunlight artifacts (21b3b69)
• qbsp: q2: fix areaportals which were broken in 2.0.0-alpha7 (70a0801)