cli (call): tui output implementation:

- Moved original UI to a separated class, and use if with the `simple` output
- By default, best output is automatically selected. For now `gui` is selected if possible,
  and `simple` is used as fallback.
- The new `tui` output can be used to have the videos directly embedded in the terminal,
  either with real videos for compatible terminal emulators, or with Unicode blocks.
- Text contrôls are used for both `simple` and `tui` outputs
- several options can be used with `--oo` (will be documented in next commit).

rel 428

pyproject.toml

@@ -80,6 +80,17 @@ keywords = [
 SVG = [
     "CairoSVG",
 ]
+GUI = [
+    "PyQt6"
+]
+TUI = [
+    "term-image ~= 0.7.1"
+]
+all = [
+    "libervia-backed[SVG]",
+    "libervia-backed[GUI]",
+    "libervia-backed[TUI]",
+]
 
 [project.scripts]
 jp = "libervia.cli.base:LiberviaCli.run"