style(ui): redesign new menu (#18)

- 2 mode classic (the old one) and modern
a2a17cab3a4bdf27abd2a956f9d53a0c4a685909
- add icon 3a11c7a6beb1dcf11e89977f380376fdea9fba89
- fix some bugs

commands/core/spec.go

@@ -7,6 +7,7 @@ type Spec struct {
 	Name        string
 	Aliases     []string
 	Description string
+	Icon        string
 	Subcommands []Subcommand
 	Options     []Option
 	Generator   GeneratorFunc
@@ -18,6 +19,7 @@ type Subcommand struct {
 	Name        string
 	Aliases     []string
 	Description string
+	Icon        string
 	Subcommands []Subcommand
 	Options     []Option
 	Generator   GeneratorFunc