Use in API and utilities WKT2_2019 instead of WKT2_2018 (fixes #1518)

- C API: PJ_GUESSED_WKT2_2019 is added, PJ_GUESSED_WKT2_2018 aliased to it
- C API: PJ_WKT2_2019[_SIMPLIFIED] is added, PJ_WKT2_2018[_SIMPLIFIED] alias to it
- C++ API: similarly for WKTFormatter::Convention::WKT2_2019[_SIMPLIFIED]
Those above changes should be fully backward API and ABI compatible.

projinfo changes:
- accept WKT2_2019 as value for -o switch. WKT2_2018 is still accepted (undocumented)
- output now uses 'WKT2_2019 string:', so might break scripts that would rely on that.

Other internal code references to WKT2_2018 changes to WKT2_2019, included
in tests.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/iso19111/common.cpp b/src/iso19111/common.cpp
index f375ea0a..d7960ee9 100644
--- a/src/iso19111/common.cpp
+++ b/src/iso19111/common.cpp
@@ -989,7 +989,7 @@ void ObjectDomain::_exportToWKT(WKTFormatter *formatter) const {
         formatter->startNode(WKTConstants::SCOPE, false);
         formatter->addQuotedString(*(d->scope_));
         formatter->endNode();
-    } else if (formatter->use2018Keywords()) {
+    } else if (formatter->use2019Keywords()) {
         formatter->startNode(WKTConstants::SCOPE, false);
         formatter->addQuotedString("unknown");
         formatter->endNode();
@@ -1192,7 +1192,7 @@ void ObjectUsage::baseExportToWKT(WKTFormatter *formatter) const {
     if (isWKT2 && formatter->outputUsage()) {
         auto l_domains = domains();
         if (!l_domains.empty()) {
-            if (formatter->use2018Keywords()) {
+            if (formatter->use2019Keywords()) {
                 for (const auto &domain : l_domains) {
                     formatter->startNode(WKTConstants::USAGE, false);
                     domain->_exportToWKT(formatter);