lib.fifo: add more compatibility shims.

Some downstream code was broken by renames in da4b810f.

nmigen/lib/fifo.py

@@ -96,36 +96,72 @@ class FIFOInterface:
     def din(self):
         return self.w_data
 
+    # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
+    @din.setter
+    @deprecated("instead of `fifo.din = x`, use `fifo.w_data = x`")
+    def din(self, w_data):
+        self.w_data = w_data
+
     # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
     @property
     @deprecated("instead of `fifo.writable`, use `fifo.w_rdy`")
     def writable(self):
         return self.w_rdy
 
+    # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
+    @writable.setter
+    @deprecated("instead of `fifo.writable = x`, use `fifo.w_rdy = x`")
+    def writable(self, w_rdy):
+        self.w_rdy = w_rdy
+
     # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
     @property
     @deprecated("instead of `fifo.we`, use `fifo.w_en`")
     def we(self):
         return self.w_en
 
+    # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
+    @we.setter
+    @deprecated("instead of `fifo.we = x`, use `fifo.w_en = x`")
+    def we(self, w_en):
+        self.w_en = w_en
+
     # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
     @property
     @deprecated("instead of `fifo.dout`, use `fifo.r_data`")
     def dout(self):
         return self.r_data
 
+    # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
+    @dout.setter
+    @deprecated("instead of `fifo.dout = x`, use `fifo.r_data = x`")
+    def dout(self, r_data):
+        self.r_data = r_data
+
     # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
     @property
     @deprecated("instead of `fifo.readable`, use `fifo.r_rdy`")
     def readable(self):
         return self.r_rdy
 
+    # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
+    @readable.setter
+    @deprecated("instead of `fifo.readable = x`, use `fifo.r_rdy = x`")
+    def readable(self, r_rdy):
+        self.r_rdy = r_rdy
+
     # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
     @property
     @deprecated("instead of `fifo.re`, use `fifo.r_en`")
     def re(self):
         return self.r_en
 
+    # TODO(nmigen-0.2): move this to nmigen.compat and make it a deprecated extension
+    @re.setter
+    @deprecated("instead of `fifo.re = x`, use `fifo.r_en = x`")
+    def re(self, r_en):
+        self.r_en = r_en
+
 
 def _incr(signal, modulo):
     if modulo == 2 ** len(signal):