Mainly bug fixes for current functions, making this release a stable version, perhaps.

New Features

• add loop mode, in which otter-launcher won't quit after running a command
• add general.callback function, so that users can control the behavior (say adjust window size) in loop mode
• add interface.prefix_padding option
• add cheatsheet, the viewer program can be configured in general.cheatsheet_viewer
• add interface.default_module_message and empty_module_message, so that users can know they are using those modules when typing
• making the programe even faster and more responsive by reducing some of uneccessary functionalities

Breaking Change

• remove per-module prehook and callback functionalities, as they can be implemented simply by scripting in module.cmd
• remove interface.prompt_prefix, just using interface.header with \n to change line can achieve the same visual effect