Bitcoin to NYC3 and update gitian compile code

.github/ISSUE_TEMPLATE.md

@@ -1,6 +1,6 @@
-<!-- This issue tracker is only for technical issues related to Bitcoin Core.
+<!-- This issue tracker is only for technical issues related to NYC3 Core.
 
-General bitcoin questions and/or support requests are best directed to the Bitcoin StackExchange at https://bitcoin.stackexchange.com.
+General bitcoin questions and/or support requests are best directed to the NYC3 StackExchange at https://bitcoin.stackexchange.com.
 
 For reporting security issues, please read instructions at https://bitcoincore.org/en/contact/.
 
@@ -13,7 +13,7 @@ If the node is "stuck" during sync or giving "block checksum mismatch" errors, p
 
 <!--- How reliably can you reproduce the issue, what are the steps to do so? -->
 
-<!-- What version of Bitcoin Core are you using, where did you get it (website, self-compiled, etc)? -->
+<!-- What version of NYC3 Core are you using, where did you get it (website, self-compiled, etc)? -->
 
 <!-- What type of machine are you observing the error on (OS/CPU and disk type)? -->
 

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,7 +2,7 @@ Pull requests without a rationale and clear improvement may be closed
 immediately.
 
 Please provide clear motivation for your patch and explain how it improves
-Bitcoin Core user experience or Bitcoin Core developer experience
+NYC3 Core user experience or NYC3 Core developer experience
 significantly.
 
 * Any test improvements or new tests that improve coverage are always welcome.
@@ -15,7 +15,7 @@ significantly.
   was fixed.
 * Features are welcome, but might be rejected due to design or scope issues.
   If a feature is based on a lot of dependencies, contributors should first
-  consider building the system outside of Bitcoin Core, if possible.
+  consider building the system outside of NYC3 Core, if possible.
 * Refactoring changes are only accepted if they are required for a feature or
   bug fix or otherwise improve developer experience significantly. For example,
   most "code style" refactoring changes require a thorough explanation why they
@@ -25,7 +25,7 @@ significantly.
   preferred in the [developer notes](/doc/developer-notes.md), stylistic code
   changes are usually rejected.
 
-Bitcoin Core has a thorough review process and even the most trivial change
+NYC3 Core has a thorough review process and even the most trivial change
 needs to pass a lot of eyes and requires non-zero or even substantial time
 effort to review. There is a huge lack of active reviewers on the project, so
 patches often sit for a long time.