Add functionality to mooring module

[hivanov-nrel]

Need to add functionality for reading in different types of mooring lines in the io module.
Mooring modular added in #235

 # TODO: get rod type property sets
        if line.count('---') > 0 and (line.upper().count('ROD DICTIONARY') > 0 or line.upper().count('ROD TYPES') > 0):
            # skip this header line, plus channel names and units lines
            line = next(f)
            # line = next(f)
            # line = next(f)
            # RodDict = dict()
            # while line.count('---') == 0:
            #     entries = line.split()
            #     #RodTypesName.append(entries[0]) # name string
            #     #RodTypesD.append(   entries[1]) # diameter
            #     RodDict[entries[0]] = entries[1] # add dictionary entry with name and diameter
            #     line = next(f)
            # #ds.attrs['ROD_TYPES'] = RodDict

        # TODO: get properties of each Body
        if line.count('---') > 0 and (line.upper().count('BODIES') > 0 or line.upper().count('BODY LIST') > 0 or line.upper().count('BODY PROPERTIES') > 0):
            # skip this header line, plus channel names and units lines
            line = next(f)
            # line = next(f)
            # line = next(f)
            # while line.count('---') == 0:
            #     entries = line.split()
            #     entry0 = entries[0].lower()

            #     num = np.int("".join(c for c in entry0 if not c.isalpha()))  # remove alpha characters to identify Body #

            #     if ("fair" in entry0) or ("coupled" in entry0) or ("ves" in entry0):       # coupled case
            #         bodyType = -1
            #     elif ("con" in entry0) or ("free" in entry0):                              # free case
            #         bodyType = 0
            #     else:                                                                      # for now assuming unlabeled free case
            #         bodyType = 0
            #         # if we detected there were unrecognized chars here, could: raise ValueError(f"Body type not recognized for Body {num}")
            #     #bodyType = -1   # manually setting the body type as -1 for FAST.Farm SM investigation

            #     r6  = np.array(entries[1:7], dtype=float)   # initial position and orientation [m, rad]
            #     r6[3:] = r6[3:]*np.pi/180.0                 # convert from deg to rad
            #     rCG = np.array(entries[7:10], dtype=float)  # location of body CG in body reference frame [m]
            #     m = np.float_(entries[10])                   # mass, centered at CG [kg]
            #     v = np.float_(entries[11])                   # volume, assumed centered at reference point [m^3]

            #     #self.bodyList.append( Body(self, num, bodyType, r6, m=m, v=v, rCG=rCG) )

            #     line = next(f)

        # TODO: get properties of each rod
        if line.count('---') > 0 and (line.upper().count('RODS') > 0 or line.upper().count('ROD LIST') > 0 or line.upper().count('ROD PROPERTIES') > 0):
            # skip this header line, plus channel names and units lines
            line = next(f)
            # line = next(f)
            # line = next(f)
            # while line.count('---') == 0:
            #     entries = line.split()
            #     entry0 = entries[0].lower()

            #     num = np.int("".join(c for c in entry0 if not c.isalpha()))  # remove alpha characters to identify Rod #
            #     lUnstr = 0 # not specified directly so skip for now
            #     #dia = RodDict[entries[2]] # find diameter based on specified rod type string
            #     nSegs = np.int(entries[9])

            #     # additional things likely missing here <<<

            #     #RodList.append( Line(dirName, num, lUnstr, dia, nSegs, isRod=1) )
            #     line = next(f)
            ```