Move solidity source to subfolder

util/calculate_erc165.py

@@ -1,17 +0,0 @@
-import sys
-import web3
-
-f = open(sys.argv[1], 'r')
-z = b''
-for i in range(32):
-    z += b'\x00'
-while True:
-    l = f.readline()
-    if l == '':
-        break
-    #print('line {}'.format(l))
-    h = web3.Web3.keccak(text=l)
-    z = bytes([a ^ b for a, b in zip(h, z)])
-    #print(h.hex(), z.hex())
-f.close()
-print(h[:4].hex())