Pywebexec

* add dynamic routes `POST /commands/<cmd>`
* `<command>.help` file content displayed:
* in web interfase as tooltip when focused on command params
* in swagger for `POST /commands/<cmd>` route
* in result of `GET /commands/executables` route
* add response schemas in swagger.yaml
* breaking changes, response format:
* `GET /commands/executables`: { executables: [command: command_name, help: helpmessage]}
* `GET /commands`: { "commands": [] }

* remove useless urlToken in js as session cookie token set

* breaking changes : API routes update

| before | after |
|--------|-----|
|GET /command_status/{id}| GET /commands/{id}|
|GET /command_ouput/{id}|GET /commands/{id}/output|
|GET /command_ouput_raw/{id}|GET /commands/{id}/output_raw|
|POST /run_command| POST /commands|
|POST /stop_command| PATCH /commands/{id}/stop|

* fix title display

* add swagger page

* better emoji display (graphemes width)
* theme colors adjust
* font change for readability on old font renderers