Process manager templating & game importing (#96)

* feat: add new template options, asahi support, and refactoring

* feat: install dir scanning, validation fixes, progress fixes, download manager refactor

This kind of ballooned out of scope, but I implemented some much
needed fixes for the download manager.

First off, I cleanup the Downloadable trait, there was some
duplication of function.

Second, I refactored the "validate" into the GameDownloadAgent,
which calls a 'validate_chunk_logic' yada, same structure as
downloading.

Third, I fixed the progress and validation issues.

Fourth, I added game scanning

* feat: out of box support for Asahi Linux

* fix: clippy

* fix: don't break database

src-tauri/src/process/format.rs

@@ -0,0 +1,33 @@
+use std::collections::HashMap;
+
+use dynfmt::{Argument, FormatArgs};
+
+pub struct DropFormatArgs {
+    positional: Vec<String>,
+    map: HashMap<&'static str, String>,
+}
+
+impl DropFormatArgs {
+    pub fn new(launch_string: String, working_dir: &String, executable_name: &String, absolute_executable_name: String) -> Self {
+        let mut positional = Vec::new();
+        let mut map: HashMap<&'static str, String> = HashMap::new();
+
+        positional.push(launch_string);
+
+        map.insert("dir", working_dir.to_string());
+        map.insert("exe", executable_name.to_string());
+        map.insert("abs_exe", absolute_executable_name);
+
+        Self { positional, map }
+    }
+}
+
+impl FormatArgs for DropFormatArgs {
+    fn get_index(&self, index: usize) -> Result<Option<dynfmt::Argument<'_>>, ()> {
+        Ok(self.positional.get(index).map(|arg| arg as Argument<'_>))
+    }
+
+    fn get_key(&self, key: &str) -> Result<Option<dynfmt::Argument<'_>>, ()> {
+        Ok(self.map.get(key).map(|arg| arg as Argument<'_>))
+    }
+}