Two alias issues of generator plugin

[songwei]

1. tpl alias could not work, looks like yo does not support more than one character for alias.
   this.option('template', {
   alias: 'tpl',
   description: 'Generate from template',
   type: String,
   });
2. t alias appears 2 times, it will cause the theia-version is set with the value of pluginType in generated package.json
   this.option('pluginType', {
   alias: 't',

this.option('theia-version', {
alias: 't',

suggestion:
I just tried replacing tpl with T and replacing the second t with V, and it could work.
The command line I used:
yo @theia/plugin:app theia-hello-world-plugin -t backend -T hello-world
and
yo @theia/plugin:app theia-hello-world-plugin -t backend -T hello-world -V latest
Both of them worked fine.