scripted-diff: Rename overloaded int GetArg to GetIntArg

Improve readability of code, simplify future scripted diff cleanup PRs, and be
more consistent with naming for GetBoolArg.

This will also be useful for replacing runtime settings type checking
with compile time checking.

-BEGIN VERIFY SCRIPT-
git grep -l GetArg | xargs sed -i 's/GetArg(\([^)]*\( [0-9]\+\|-1\|port\|BaseParams().RPCPort()\|Params().GetDefaultPort()\|_TIMEOUT\|Height\|_WORKQUEUE\|_THREADS\|_CONNECTIONS\|LIMIT\|SigOp\|Bytes\|_VERSION\|_AGE\|_CHECKS\|Checks() ? 1 : 0\|_BANTIME\|Cache\|BLOCKS\|LEVEL\|Weight\|Version\|BUFFER\|TARGET\|WEIGHT\|TXN\|TRANSACTIONS\|ADJUSTMENT\|i64\|Size\|nDefault\|_EXPIRY\|HEIGHT\|SIZE\|SNDHWM\|_TIME_MS\)\))/GetIntArg(\1)/g'
-END VERIFY SCRIPT-

Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>

src/qt/intro.cpp

@@ -113,7 +113,7 @@ namespace {
 //! Return pruning size that will be used if automatic pruning is enabled.
 int GetPruneTargetGB()
 {
-    int64_t prune_target_mib = gArgs.GetArg("-prune", 0);
+    int64_t prune_target_mib = gArgs.GetIntArg("-prune", 0);
     // >1 means automatic pruning is enabled by config, 1 means manual pruning, 0 means no pruning.
     return prune_target_mib > 1 ? PruneMiBtoGB(prune_target_mib) : DEFAULT_PRUNE_TARGET_GB;
 }
@@ -142,7 +142,7 @@ Intro::Intro(QWidget *parent, int64_t blockchain_size_gb, int64_t chain_state_si
 
     const int min_prune_target_GB = std::ceil(MIN_DISK_SPACE_FOR_BLOCK_FILES / 1e9);
     ui->pruneGB->setRange(min_prune_target_GB, std::numeric_limits<int>::max());
-    if (gArgs.GetArg("-prune", 0) > 1) { // -prune=1 means enabled, above that it's a size in MiB
+    if (gArgs.GetIntArg("-prune", 0) > 1) { // -prune=1 means enabled, above that it's a size in MiB
         ui->prune->setChecked(true);
         ui->prune->setEnabled(false);
     }