Implement BIP 9 GBT changes

- BIP9DeploymentInfo struct for static deployment info
- VersionBitsDeploymentInfo: Avoid C++11ism by commenting parameter names
- getblocktemplate: Make sure to set deployments in the version if it is LOCKED_IN
- In this commit, all rules are considered required for clients to support

src/versionbits.h

@@ -30,6 +30,13 @@ enum ThresholdState {
 // will either be NULL or a block with (height + 1) % Period() == 0.
 typedef std::map<const CBlockIndex*, ThresholdState> ThresholdConditionCache;
 
+struct BIP9DeploymentInfo {
+    /** Deployment name */
+    const char *name;
+};
+
+extern const struct BIP9DeploymentInfo VersionBitsDeploymentInfo[];
+
 /**
  * Abstract class that implements BIP9-style threshold logic, and caches results.
  */