Improving building system

[tornac1234]

• Ladders save fix (Ladders disappear #1346)
• Red structures common case fix
• Sign metadata case for Signs
• Fix buildings in multipurpose rooms (ladders and alien containments)
• Fix building through environment breaking the system
• Fix building that have a little construct/destruct time (e.g BaseReinforcement and BaseWindow)
• Need help with testing

I already had a test session with my brother which turned out way better than before. We built lot of things and we didn't encounter any red structure, tho there are still bugs with BaseHatches but I don't know where they come from (maybe Alien Containments) [OLD]

[tornac1234]

Important to note that the command fastbuild (which is also executed by the command bobthebuilder) may easily cause desyncs

[tornac1234]

Since the more global PR containing this PR was merged, there's no need for this to stay opened.