WIP: Footprints for MCU_NXP_Kinetis symbols

[DerekGn]

Footprints for MCU_NXP_Kinetis cleanup KiCad/kicad-symbols#128

Added XFBGA-64_5.0x5.0mm_Layout8x8_P0.5mm.kicad_mod
https://www.nxp.com/docs/en/package-information/98ASA00420D.pdf?fsrch=1&sr=1&pageNum=1

Added WLCSP-20_1.994x1.94mm_Layout4x5_P0.4mm.kicad_mod
https://www.nxp.com/docs/en/package-information/98ASA00539D.pdf

Added WLCSP-20_1.994x1.609mm_Layout5x4_P0.4mm
https://www.nxp.com/docs/en/package-information/98ASA00676D.pdf

Added XFBGA-36_3.5x3.5mm_Layout6x6_P0.5mm
https://www.nxp.com/docs/en/package-information/SOT1555-1.pdf

Added XFBGA-121_8x8mm_Layout11x11_P0.65mm
https://www.nxp.com/docs/en/package-information/SOT1533-1.pdf

Added WLCSP-36_2.82x2.67mm_Layout6x6_P0.4mm
https://www.nxp.com/docs/en/package-information/98ASA00949D.pdf

Added WLCSP-36_2.374x2.459mm_Layout6x6_P0.35mm
https://www.nxp.com/docs/en/package-information/98ASA00604D.pdf

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Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

• Provide a URL to a datasheet for the footprint(s) you are contributing
• An example screenshot image is very helpful
• If there are matching symbol or 3D model PRs, provide link(s) as appropriate
• Check the output of the Travis automated check scripts - fix any errors as required

[DerekGn]

I noticed that I missed the bevel on the F.Fab i will fix later and update the FP.

[SchrodingersGat]

Thanks!