Allow any book to be placed in a bookshelf

- Modifies the bookshelf model and blockstate to choose a texture dynamically based on the book item
- Changes bookshelf slots to accept all books from wizardry and vanilla minecraft by default
- Adds a couple of hooks to allow addons to register their own book items and model textures
- Adds a config option to allow modpack makers to add more book items

src/main/resources/assets/ebwizardry/lang/en_gb.lang

@@ -1238,6 +1238,8 @@ config.ebwizardry.bow_item_whitelist=Bow Item Whitelist
 config.ebwizardry.bow_item_whitelist.tooltip=List of registry names of items which should count as bows for imbuement spells. Most bows should work automatically, but those that don't can be added manually here. Item names are not case sensitive. For mod items, prefix with the mod ID (e.g. tconstruct:shortbow).
 config.ebwizardry.bookshelf_blocks=Bookshelf Blocks
 config.ebwizardry.bookshelf_blocks.tooltip=List of registry names of blocks that count as bookshelves for the arcane workbench and lectern. Block names are not case sensitive. For mod blocks, prefix with the mod ID (e.g. ebwizardry:oak_bookshelf).
+config.ebwizardry.book_items=Book Items
+config.ebwizardry.book_items.tooltip=List of registry names of items which can be placed in a bookshelf, in addition to the defaults. Item names are not case sensitive. For mod items, prefix with the mod ID (e.g. thaumcraft:thaumonomicon).
 config.ebwizardry.bookshelf_search_radius=Bookshelf Search Radius
 config.ebwizardry.bookshelf_search_radius.tooltip=The maximum number of blocks a bookshelf can be from an arcane workbench or lectern to be able to link to it.
 config.ebwizardry.currency_items=Currency Items

src/main/resources/assets/ebwizardry/lang/en_us.lang

@@ -1238,6 +1238,8 @@ config.ebwizardry.bow_item_whitelist=Bow Item Whitelist
 config.ebwizardry.bow_item_whitelist.tooltip=List of registry names of items which should count as bows for imbuement spells. Most bows should work automatically, but those that don't can be added manually here. Item names are not case sensitive. For mod items, prefix with the mod ID (e.g. tconstruct:shortbow).
 config.ebwizardry.bookshelf_blocks=Bookshelf Blocks
 config.ebwizardry.bookshelf_blocks.tooltip=List of registry names of blocks that count as bookshelves for the arcane workbench and lectern. Block names are not case sensitive. For mod blocks, prefix with the mod ID (e.g. ebwizardry:oak_bookshelf).
+config.ebwizardry.book_items=Book Items
+config.ebwizardry.book_items.tooltip=List of registry names of items which can be placed in a bookshelf, in addition to the defaults. Item names are not case sensitive. For mod items, prefix with the mod ID (e.g. thaumcraft:thaumonomicon).
 config.ebwizardry.bookshelf_search_radius=Bookshelf Search Radius
 config.ebwizardry.bookshelf_search_radius.tooltip=The maximum number of blocks a bookshelf can be from an arcane workbench or lectern to be able to link to it.
 config.ebwizardry.currency_items=Currency Items