Move 15 loose scripts from contrib/ root to contrib/scripts/

Consolidate all standalone utility scripts into contrib/scripts/:
- Perl: avg_blocktime.pl, block_time.pl, gen-zaddrs.pl, sda_checkpoints.pl,
  sdl_checkpoints.pl, hush_block_subsidy_per_halving, hush_halvings,
  hush_scanner, hush_supply, hush_supply_old
- Shell: fresh_clone_compile_and_run.sh, tidy_datadir.sh, dragonx_scanner
- Python: convert_address.py
- BAT: hush-uri.bat

Update path references in contrib/README.md, doc/OLD_WALLETS.md,
doc/relnotes/README.md, and sdl_checkpoints.pl.

contrib/README.md

@@ -14,7 +14,7 @@ Estimate when a Hush block will happen.
 
 Example:
 
-    ./contrib/block_time.pl  123456 # Print out datetime of when block height 123456 happens
+    ./contrib/scripts/block_time.pl  123456 # Print out datetime of when block height 123456 happens
 
 ## gen-zaddrs.pl
 
@@ -22,8 +22,8 @@ Generate zaddrs in bulk, by default 50 at a time. Prints out a zaddr one per lin
 
 Example:
 
-    ./contrib/gen-zaddrs.pl     # generate 50 zaddrs
-    ./contrib/gen-zaddrs.pl 500 # generate 500 zaddrs
+    ./contrib/scripts/gen-zaddrs.pl     # generate 50 zaddrs
+    ./contrib/scripts/gen-zaddrs.pl 500 # generate 500 zaddrs
 
 
 ## Wallet Tools

contrib/scripts/sdl_checkpoints.pl

@@ -10,7 +10,7 @@ use warnings;
 use strict;
 
 # call this script like this to generate checkpoints for a HAC such as DragonX:
-# CLI=./src/dragonx-cli ./contrib/sdl_checkpoints.pl ...
+# CLI=./src/dragonx-cli ./contrib/scripts/sdl_checkpoints.pl ...
 
 my $hush    = $ENV{CLI} || "./src/hush-cli";
 my $gethash = "$hush getblockhash";

doc/OLD_WALLETS.md

@@ -19,7 +19,7 @@ with `t1` and now they begin with `R`.
 To see what an old HUSH v2 address looks like on the new chain, this online tool
 can be used: https://dexstats.info/addressconverter.php
 
-or this command line tool: https://git.hush.is/hush/hush3/src/master/contrib/convert_address.py
+or this command line tool: https://git.hush.is/hush/hush3/src/master/contrib/scripts/convert_address.py
 
 
 ### Using an old wallet.dat

doc/codebase-cleanup.md

@@ -134,4 +134,4 @@ Docs are split across `doc/`, `contrib/README.md`, and the root.
 4. Item **5** — move implementation out of headers
 5. Item **4** — split monolithic source files
 6. Item **6** — deduplicate cJSON
-7. Item **2** — Move shell scripts to `contrib/scripts/` directory
+7. Item **2** — ~~Move shell scripts to `contrib/scripts/` directory~~ Done — moved 15 loose scripts from `contrib/` root into `contrib/scripts/`

doc/relnotes/README.md

@@ -231,8 +231,8 @@ since it contains various bugfixes and improvements that will benefit busy walle
   * sendmany RPC will now reject transactions that send to taddrs immediately, instead of them being rejected in mempool
   * Preliminary support for FreeBSD has been added to the Hush build system
   * New contrib scripts:
-    * `contrib/gen-zaddrs.pl` - Generate zaddrs in bulk, defaults to 50
-    * `contrib/sdl_checkpoints.pl` - Generate SDL checkpoints using `getblockmerkletree`
+    * `contrib/scripts/gen-zaddrs.pl` - Generate zaddrs in bulk, defaults to 50
+    * `contrib/scripts/sdl_checkpoints.pl` - Generate SDL checkpoints using `getblockmerkletree`
   * ZeroMQ support has been removed from Hush
 
 # Hush 3.9.1 "Luciferous Locust"