Add new tetra-Board and arduino files Add AMP_1_0, AVC_1_0, D18_1_1, IOP_1_2, MIC_1_0, PIN_1_1, POT_1_0, PWA_1_0, PWR_1_0, RGF 2.0, SOC_2_0, VLT_1_0 Add mex_nano_shield_keyboard, mex_nano_shied_numbers New arduino projects

Missing doc files added, schematics.pdf created +doc/pdf/schematics.pdf: all schematics in one file

Files renamed to new board codes