Renaming and restructuring directives and components based on ng naming guidelines

[ddincheva]

Closes #536

Additional information related to this pull request:

[kdinev]

This would again be inconsistent, as the IgxLabel is not called IgxLabelDirective. Please check all the directives, and if they all follow the Igx<DirName> format, then leave it as IgxInput. If not, then we should discuss which naming to go with.

[kdinev]

OK, I checked. The whole thing is totally inconsistent. The IgxFilterDirvective, IgxRippleDirective, IgxDraggableDirective and IgxDroppableDirective are all located under the directives folder and follow the Igx<DirName>Directive naming.

The IgxLabel, IgxInputClass, IgxLayout and IgxButton directives are all in their own folders and follow mostly the Igx<DirName> naming, except for the input.

I think we should unify all this and either move them all under directives and call the classes uniformly, or move them all into their all folders and again name them uniformly, or move them all into their own folders under the directives folder and again name them all uniformly.

[zdrawku]

We are going to make consistent all directives and modules first

[zdrawku]

Issue description is updated based on the latest comments and recommendations

[kdinev]

Since this is a major breaking change that affects pretty much every component and directive, this should come with all necessary documentation updates, as well as sample updates ready to be deployed at the time of tagging. Please implement all README updates, demo updates, and docfx updates. Make sure to check with the igniteui-cli team for all view and project template updates.

Another thing is that checks for the correct naming should be performed on a CI level. Please implement this as well!

[zdrawku]

@ddincheva I have updated the issue with additional note, all documents (topics, readme.md files and wiki pages) should be updated with the structural and naming changes (demos, docfx). Also, could you move dragdrop, filter and ripple directives in separate folders within 'directives' folder as well.

@damyanpetev we are renaming some directives and components, this would affect the ig cli project. Is it possible someone from your team to check what additional changes should be implemented from cli point of view, and use this pull request as a base. This is important as it would introduce some breaking changes.

[zdrawku]

The only task that left is to add codelyzer to the repo. @ddincheva I am going to add this to the requirements in the issue.

[zdrawku]

Related pull request IgniteUI/igniteui-angular-samples#45

[zdrawku]

There is conflicting file @damyanpetev could you please have a look