Rename package to strawcore-core

Straw's wrapper crate already owns the name 'strawcore' (and that name
is baked into the Android .so file + Kotlin's System.loadLibrary call).
Renaming this extractor crate to 'strawcore-core' resolves the cargo
package-name collision so both can live in the same workspace dep tree.

Repo name on Gitea stays Sulkta-Coop/strawcore.

Cargo.lock

@@ -985,7 +985,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
 [[package]]
-name = "strawcore"
+name = "strawcore-core"
 version = "0.1.0"
 dependencies = [
  "once_cell",

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "strawcore"
+name = "strawcore-core"
 version = "0.1.0"
 edition = "2021"
 license = "GPL-3.0-or-later"