Add support for a few meteor skill tree nodes

[ronoudgenoeg]

Adds support for:

• "number of .* for direct casts
• always crits above x mana

Description of the problem being solved:

The above mods were not supported.

Steps taken to verify a working solution:

• Pick nodes on Meteor containing these affixes
• See DPS go up the expected amount

Link to build showing support: https://sharetext.io/ozy5z4je

Before screenshot:

Below mods didn't add anything before fixes.

After screenshot:

[Musholic]

Thanks for the contribution, it looks good. If you are willing and comfortable enough, it could help to have a simple automated test similar to this one: https://github.com/Musholic/LastEpochPlanner/blob/dev/spec/System/TestModParse_spec.lua#L133
But I won't be picky with the first external PR, I can merge it as is on Monday after I double check a few things.

[Musholic]

Thanks for the automated test, I guess the generalisation of "number of (%a[%a ]*) for direct casts" was not strictly necessary since it's a skill tree node (and thus does only apply to the meteor skill in this case) but it makes sense to do it so I'm fine with it.