Solarium fixes and tweaks

Some fixes/improvements on Solarium:

• Deleted some degenerated 1-dimensional patches reported by q3map2
• Reduced the size of the water brushes
• Removed a few useless brushes and merged brushes where possible
• Use trak5x\misc-glass instead of invisible clips for the big windows
• Caulk some invisible surfaces
• More detail brushes
• Improved the clips in the MH corridor ("invisible wall" here: https://imgur.com/a/pJ3RXOI)
• Removed a light entity stuck inside a brush
• Fixed a few texture issues:
  • Visible caulk on the roof: https://imgur.com/a/acQOHPD
  • Wrong texture: https://imgur.com/a/u8rTTQw
  • Another wrong texture: https://imgur.com/a/b7TNCRX
  • Stretched texture: https://imgur.com/a/Xo41kXz
  • Another stretched texture (barely visible): https://imgur.com/a/4RPgTo5
  • Other minor/barely visible texture alignment issues.
• Fix #162 (closed)