Add support for linkText and partialLinkText search locators to @SelendroidFindBy annotation

[clicman]

Since @SelendroidFindBy(name="...") actually serches by accessibility id (according to selendroid documentation), I`ve added support for linkText and partialLinkText search strategies which searches by displayed element text.

[TikhomirovSergey]

Good! :) But...
@clicman please improve test here: https://github.com/clicman/java-client/commit/0c2f13d3346d0dd647518fa0c0e11e2b3dfbba40#diff-19d657f49e403606a5f2ecf5f42a4bafR72
Partial text should be here :)

Also. It is a little wish. What do think about the remaming of linktext and partiallinktext to text and partialtext? :)

@SelendroidFindBy(text = "Accessibility")

and

@SelendroidFindBy(partialtext = "cessibilit")

As all this work has been done for native contents so I think this strategy names are more meaningful.

[clicman]

Also. It is a little wish. What do think about the remaming of linktext and partiallinktext to text and partialtext? :)

My opinion is keep it like it named in webdriver methods to conform naming across the api. More variation - more confusion.

[TikhomirovSergey]

ok!