MAPS: New start map.

[RandomBrushes]

Description of Changes

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This introduces a new start map, "The Arrival".

• Episodes 1 to 4 are directly accessible.
• The start of episode 0 and the dev maps are in a secret.
• The exit to the end-map will open once the ep1 to ep4 runes are collected.
• supports deathmatch and coop.

Visual Sample

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Checklist

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• I have read the LibreQuake contribution guidelines
• I have thoroughly tested my changes to the best of my ability
• I confirm I have not contributed anything that would impact LibreQuake's licensing and usage
• This Pull Request fixes a critical issue that should be reviewed and merged as soon as possible

[lavenderdotpet]

lav-start-2.dem.zip

[lavenderdotpet]

Description of Changes

• wad: fixed missing fullbrights in the skills texture
• build: added e0 start to main maps list

[RandomBrushes]

Converted to draft because there will be further updates to the map