Add opir1 (Orange Pi R1)

[DaveBuechi]

Introduce Orange Pi R1.

Rudimentary tested with the following case:

"opir1_shell": {
    "$fn": "90",
    "accessory_highlight": "false",
    "accessory_name": "none",
    "adjust": "0.01",
    "bottom_ext_standoff": "[6.25, 0, 2.5, 8, 4, 1, 0, 0, 0, 4.5, 5.1]",
    "bottom_front_left": "0",
    "bottom_front_right": "0",
    "bottom_rear_left": "0",
    "bottom_rear_right": "0",
    "bottom_standoff": "[5.5, 2, 3.5, 8, 3, 1, 1, 0, 0, 4.5, 5.1]",
    "c_fillet": "3.5",
    "case_design": "shell",
    "case_ext_standoffs": "false",
    "case_ffn": "90",
    "case_fn": "360",
    "case_offset_bz": "4",
    "case_offset_tz": "7",
    "case_offset_x": "0",
    "case_offset_y": "1",
    "case_style": "none",
    "cooling": "none",
    "exhaust_vents": "none",
    "fillet": "0",
    "floorthick": "1.5",
    "gap": "1.5",
    "gpio_opening": "none",
    "indents": "true",
    "individual_part": "bottom",
    "lip": "5",
    "lower_bottom": "0",
    "move_front": "0",
    "move_leftside": "0",
    "move_rear": "0",
    "move_rightside": "0",
    "pcb_loc_x": "0",
    "pcb_loc_y": "1.5",
    "pcb_loc_z": "0",
    "raise_top": "0",
    "sata_punchout": "false",
    "sbc_bottom_standoffs": "true",
    "sbc_highlight": "false",
    "sbc_model": "opir1",
    "sbc_off": "false",
    "sbc_top_standoffs": "true",
    "sidethick": "1.5",
    "sidewall_support": "false",
    "tol": "0.25",
    "top_ext_standoff": "[6.25, 0, 2.25, 8, 4, 4, 0, 1, 0, 4.5, 5.1]",
    "top_front_left": "0",
    "top_front_right": "0",
    "top_rear_left": "0",
    "top_rear_right": "0",
    "top_standoff": "[5.5, 0, 3.5, 8, 4, 4, 1, 1, 1, 3.5, 5.1]",
    "view": "platter",
    "vu_rotation": "[15, 0, 0]",
    "wallthick": "1.5"
}