[WIP] Extension API version 2 update

[MiaoMint]

Add @tags metadata for filtering extensions

The option to filter by tag will be added to the extension repository page

Removing class only requires writing specific methods

Simply write it to the top level of the code, without wrapping the class

Miru-specific operations are performed only with Miru objects

For example, Miru.registerSetting

Add Miru.rawRequest method

Get Response header and will not automatically add baseUrl

Add Miru.storage related methods for persistent data storage

Add methods to read and write cookies

Show messages from extensions

[MiaoMint]

Compatible with older extensions without changes, to use version 2 features you need to set the metadata @apiVersion to 2.

[OshekharO]

Compatible with older extensions without changes, to use version 2 features you need to set the metadata @apiVersion to 2.

In case I add @apiversion 2 and doesn't make any other changes will it break the extension? Also tag is compulsory or optional?

[bachig26]

In case I add @apiversion 2 and doesn't make any other changes will it break the extension?

from the outlook of this looks like it'll break the extension.

Also tag is compulsory or optional?

also the tag looks only for filter similar to '@ICON', '@license', etc.

[MiaoMint]

@OshekharO

Adding @apiVersion 2 to the previous extensions will break them, but don't worry, the previously written extensions do not need to be modified and can still function properly.

@tags is not a required field

[OshekharO]

an extension is broken but currently I don't have time to fix it so I just added 0

 * Status int as the following:
 * 0: Down ( false )
 * 1: Ok (true) by default 

In

// ==MiruExtension==
// @status 1 ( it can be true, false also )
// ==/MiruExtension==

Adding 0 should hide the extension from application warehouse and when I change 0 to 1 in in extension it should show the extension.

[shashankx86]

@MiaoMint #157