v1.2 - a variety of small improvements

Spread the word: 59% support of waiving all patent protections to produce generic versions of life-saving medicines for critical diseases

• remove ruleset requirements as it should work in most rulesets
• add extraplanar name detection for 'extraplanar' and 'weightless'
• add mundane container name detection for 'container'
• cleanup code and improve documentation for easier collaboration and use by others
• fix mundane detection sometimes overriding extraplanar detection
• fix visibility of weight fields behaving strangely when weight of container is zero
• HOTFIX April 11: fix item sheet in 4E

See previous release:
https://github.com/bmos/FG-PFRPG-Extraplanar-Containers/releases/tag/v1.1