Allows setting a mask used for block traces. This allows brush tools to
pass through various materials, such as water (e.g. `/tracemask #solid`
or `/tracemask !air,water`) before starting to build.
By default, a null mask is equivalent to #existing (original behavior).
https://gfycat.com/ImmaculateFrayedCockatiel
Legacy mapper now uses the data fixers to upgrade blocks and item types
(e.g. signs, dyes that changed names in 1.14).
The sponge schematic reader can now attempt to use the data fixers to
upgrade blocks, block entities, biomes and entities. This has been
tested with the 1.13 -> 1.14 changes. It is yet to be seen if it will
continue to work because...
The mc edit schematic reader has code for using data fixers, but it is
currently disabled as there seem to be some issues with fixing up older
block entities.
Closes a few old youtrack issues which I don't remember because I had
like 30 tabs open, and a few other issues which I found while testing
some of those.
Refactored PaginationBox to be abstract. Implementations can generate individual components as needed now.
Add lots of Component usage to schematic list, help listings, etc.
Fix a few schematic and file resolution issues.
* Not all EntityTypes in Bukkit have the correct enum name.
* Don't read entire schematic files to list. Go off file extension only.
(Reading in files is more accurate, but slow.)
* Enforce extensions. (Due to the above, while you can technically make a
schematic called 'test.txt', it's better that we save it as
'test.txt.schem'.)
* Fix a few minor warnings.
