Big project dir refactor

* split into multi member workspace in preparation for a no_std core
* env and posix stuff neatly crammed into a seperate shell project
* some pokes at interactive-devel.f
* updated ci
* removed 'l' shortcut for 'load' and update docs
* remove out of date readme content
* updated tests
* more sensible cond implementation and extra tests
* substr stdlib function with tests

Signed-off-by: Ava Affine <ava@sunnypup.io>

Cargo.toml

@@ -1,25 +1,6 @@
-[package]
-name = "flesh"
-version = "0.4.0"
-authors = ["Ava <ava@sunnypup.io>"]
-edition = "2021"
-
-[dependencies]
-# used in config (src/run.rs)
-dirs = "3.0"
-# these two are used in src/bin/relish.rs to manage a prompt
-nu-ansi-term = "0.47.0"
-reedline = "0.17.0"
-# used by main shell to update console dimensions
-termion = "2.0.1"
-# these two used in posix shell layer (src/stl/posix.rs)
-nix = { version = "0.26.2", optional = true }
-libc = { version = "0.2.144", optional = true }
-# this one provides a global constant lookup table for simple
-# string escaping in the lexer
-phf = { version = "0.11", default-features = false, features = ["macros"] }
-
-[features]
-default = ["posix"]
-posix = ["dep:nix", "dep:libc"]
-implicit-load = ["posix"]
+[workspace]
+resolver = "2"
+members = [
+	"shell",
+	"core"
+]