Remove uploadkeys encryption features

It doesn't really make sense to encrypt the keys, but store the secret
literally in the same directory. uploadkeys will now be stored in
plaintext. The branch `legacy` has the old code from before this commit.

imgupload.py

@@ -34,20 +34,13 @@ def upload():
     if request.method == "POST":  # sanity check: make sure it's a POST request
         print("Request method was POST!")
 
-        with open(settings.ENCKEY_PATH,"rb") as enckey: # load encryption key
-            key = enckey.read()
-        f = Fernet(key)
-
-        with open("uploadkeys", "rb") as keyfile:
-            encrypted_data = keyfile.read()
-        decrypted_data = str(f.decrypt(encrypted_data).decode('utf-8'))
-        decrypted_data = decrypted_data.splitlines()
-
-        validkeys = [x.strip("\n") for x in decrypted_data]
+        with open("uploadkeys", "r") as keyfile:  # load valid keys
+            validkeys = keyfile.readlines()
+        validkeys = [x.strip("\n") for x in validkeys]
         while "" in validkeys:
             validkeys.remove("")
-            print("Removed blank key(s)")
         print("Loaded validkeys")
+
         if "uploadKey" in request.form:  # if an uploadKey was provided
             if request.form["uploadKey"] in validkeys:  # check if uploadKey is valid
                 print("Key is valid!")