Migrate grc blocks from xml to yaml

Convert the blocks using cmdline_converter.py script from
https://gist.githubusercontent.com/haakov/4228ff6a14486641add538483093e86b/raw/c861a840e31182ace2e74f5425e356cb4f8b183a/cmdline_converter.py

Change-Id: Iee5c611a2e100bd2fdf487611a867dc937d8c292
diff --git a/grc/transmitter/gsm_txtime_setter.block.yml b/grc/transmitter/gsm_txtime_setter.block.yml
new file mode 100644
index 0000000..76a3f37
--- /dev/null
+++ b/grc/transmitter/gsm_txtime_setter.block.yml
@@ -0,0 +1,67 @@
+# auto-generated by grc.converter
+
+id: gsm_txtime_setter
+label: txtime_setter
+
+parameters:
+-   id: init_fn
+    label: init_fn
+    dtype: raw
+    default: None
+    hide: part
+-   id: init_time_secs
+    label: init_time_secs
+    dtype: int
+    default: '0'
+    hide: part
+-   id: init_time_fracs
+    label: init_time_fracs
+    dtype: float
+    default: '0'
+    hide: part
+-   id: time_hint_secs
+    label: time_hint_secs
+    dtype: int
+    default: '0'
+    hide: part
+-   id: time_hint_fracs
+    label: time_hint_fracs
+    dtype: float
+    default: '0'
+    hide: part
+-   id: timing_advance
+    label: timing_advance
+    dtype: float
+    default: '0'
+    hide: part
+-   id: delay_correction
+    label: delay_correction
+    dtype: float
+    default: '0'
+    hide: part
+
+inputs:
+-   domain: message
+    id: fn_time
+    optional: true
+-   domain: message
+    id: bursts_in
+    optional: true
+
+outputs:
+-   domain: message
+    id: bursts_out
+    optional: true
+
+templates:
+    imports: import grgsm
+    make: grgsm.txtime_setter(${init_fn} if (${init_fn} is not None) else 0xffffffff,
+        ${init_time_secs}, ${init_time_fracs}, ${time_hint_secs}, ${time_hint_fracs},
+        ${timing_advance}, ${delay_correction})
+    callbacks:
+    - set_fn_time_reference(${init_fn}, ${init_time_secs}, ${init_time_fracs})
+    - set_time_hint(${time_hint_secs}, ${time_hint_secs})
+    - set_timing_advance(${timing_advance})
+    - set_delay_correction(${delay_correction})
+
+file_format: 1