Pyedflib

* 166 replace imp with imporlib

* 164 use oldest-supported-numpy to build

* 147 np.float is deprecated
* 151 Fix false positive fortran order warning
* 153 Remove limit on numpy version
* 154 Build Python 3.10 wheels for aarch64
* 155 Run tests on Python 3.10
* 158 replace lines in accordance with edflib
* 160 Add tests for ChannelDoesNotExist Exception
* 162 Cleanup CIs
* 163 Remove appveyor, tox & add windows-2016

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* 124 updated edfWriter:setSignalHeaders to update default dicts instead of overwriting
* 126 Fix annotation bytestring
* 127 Cleanup travis buildscript
* 125 non-empty data check in edfwriter to prevent unknown OS error
* 121 Fix sample frequencies for record duration != 1
* 134 add warnings if dmin/dmax/pmin/pmax is out of bounds
* 135 split up Errors in FileNotFoundError and OSError
* 136 suppress warnings in tests
* 114 Be less strict about prefilter fields
* 137 improved speedup write with F-contiguous arrays