major usability improvements

Terminal now modal, supports line buffering, stdin, because it uses pty (and threading). Also supports paste, again (?). Audio player queueing no longer blocks, supports appending. Now can change window size. Halfscreen window shortcut improved. Eliminate dirs dep, deconstruct audiotags dep, better feature flags. Remove .alpha files because they are built. Use /home/jondough for default dirs if possible. Themes config. Fix for rotated touchscreen. Write more docs

src/bin/malvim.rs

@@ -9,6 +9,7 @@ use ming_wm::themes::ThemeInfo;
 use ming_wm::framebuffer::Dimensions;
 use ming_wm::window_manager::{ DrawInstructions, WindowLike, WindowLikeType };
 use ming_wm::utils::{ calc_actual_lines, calc_new_cursor_pos, Substring };
+use ming_wm::dirs::home;
 use ming_wm::ipc::listen;
 
 const MONO_WIDTH: u8 = 10;
@@ -496,8 +497,10 @@ impl Malvim {
       let mut failed = false;
       let mut new_path = if self.files.len() > 0 && !arg.starts_with("/") {
         PathBuf::from(self.files[self.current_file_index].path.clone()).parent().unwrap().to_path_buf()
-      } else {
+      } else if arg.starts_with("/") {
         PathBuf::from("/")
+      } else {
+        home().unwrap_or(PathBuf::from("/"))
       };
       for part in arg.split("/") {
         if part == ".." {