Fix armor limit and synchronization between client and server

[Nico8340]

Fixes #3982

[ghost]

Just an opinion: Maybe the cap should be 150 and not 100 as this is an original (singleplayer) behaviour.
The max health bug will be fixed after 1.6.1 which means that players will have the original maximum max health(176) instead of 200, so it would be better to have the armor cap raised to 150 as well.

[Nico8340]

Just an opinion: Maybe the cap should be 150 and not 100 as this is an original (singleplayer) behaviour. The max health bug will be fixed after 1.6.1 which means that players will have the original maximum max health(176) instead of 200, so it would be better to have the armor cap raised to 150 as well.

That will be in a separate pull request because this change is needed as soon as possible so that cheaters cannot exploit it, and it would also require a deeper modification to the synchronization, which is needed anyway because the current armor sync is inaccurate

[Nico8340]

This pull request is fully backward compatible, I tried to keep the number of changes as low as possible so that it can be merged as soon as possible