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* remove out of date readme content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>

src/error.rs

@@ -1,99 +0,0 @@
-/* Flesh: Flexible Shell
- * Copyright (C) 2021 Ava Affine
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-use std::fmt;
-
-#[derive(Debug, Clone)]
-pub struct TraceItem {
-    pub caller:  String,
-    pub message: String,
-}
-
-#[derive(Debug, Clone)]
-pub struct Traceback(pub Vec<TraceItem>);
-
-pub fn start_trace(item: TraceItem) -> Traceback {
-    Traceback::new().with_trace(item)
-}
-
-impl Traceback {
-    pub fn new() -> Traceback {
-        Traceback(vec![])
-    }
-
-    pub fn with_trace(mut self, item: TraceItem) -> Traceback {
-        self.0.push(item);
-        self
-    }
-
-    pub fn depth(&self) -> usize {
-        self.0.len()
-    }
-}
-
-impl fmt::Display for Traceback {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        _ = writeln!(f, "** ERROR TRACEBACK");
-        for trace in self.0.iter().rev() {
-            _ = writeln!(f, " > {}: {}", trace.caller, trace.message);
-        }
-        writeln!(f, "Please refactor forms and try again...")
-    }
-}
-
-
-impl std::convert::From<Traceback> for String {
-    fn from(arg: Traceback) -> Self {
-        format!("{}", arg)
-    }
-}
-
-impl std::convert::From<(&String, &str)> for TraceItem {
-    fn from(value: (&String, &str)) -> Self {
-        TraceItem {
-            caller:  value.0.clone(),
-            message: String::from(value.1),
-        }
-    }
-}
-
-impl std::convert::From<(&String, String)> for TraceItem {
-    fn from(value: (&String, String)) -> Self {
-        TraceItem {
-            caller: value.0.clone(),
-            message: value.1,
-        }
-    }
-}
-
-impl std::convert::From<(&str, String)> for TraceItem {
-    fn from(value: (&str, String)) -> Self {
-        TraceItem {
-            caller: String::from(value.0),
-            message: value.1,
-        }
-    }
-}
-
-impl std::convert::From<(&str, &str)> for TraceItem {
-    fn from(value: (&str, &str)) -> Self {
-        TraceItem {
-            caller: String::from(value.0),
-            message: String::from(value.1),
-        }
-    }
-}