Moved lookup tables into separate struct to fix some race conditions

Fixed lingering issues due to zero work size InodeFinish
Fixed xattrs not applying due to the keys sometimes not being
null-terminated.
Updated performance numbers

README.md

@@ -37,7 +37,7 @@ Most features are present except for the following:
 
 This is some basic observation's I've made about this library's performance when compared to `unsquashfs`. Unless otherwise stated, most observations were made when extracting my test archive (which is fairly small and uses zstd compression) and with `--release=fast`.
 
-* Under ideal circumstances, my library is ~60% slower (.12s vs .19s).
+* Under ideal circumstances, my library is ~70% slower (.12s vs .20s).
 * Using Zig decompression libraries *significantly* increases decompression time by ~600%. Under ideal circumstances.
 * Performance improvements/regressions will be common. I'm still learning Zig.
 
@@ -45,8 +45,8 @@ Example Times:
 
 * *unsquashfs, multi-threaded*: .12s
 * *unsquashfs, single-threaded*: .13s
-* *C-libs, single-threaded*: .56s
-* *C-libs, multi-threaded*: .19s
+* *C-libs, single-threaded*: .45s
+* *C-libs, multi-threaded*: .20s
 * *Zig-libs, single-threaded*: 5.78s
 * *Zig-libs, multi-threaded*: 1.08s