get rid of piForeach

apply some code analyzer recommendations
ICU flag now check if libicu exists
prepare for more accurate growth of containers (limited PoT, then constantly increase size)

libs/main/containers/picontainers.cpp

@@ -19,8 +19,11 @@
 
 #include "picontainers.h"
 
+#include "piliterals_bytes.h"
 
-const size_t minAlloc = 64;
+
+const size_t minAlloc    = 64;
+const size_t maxPoTAlloc = 4_MiB;
 
 
 size_t _PIContainerConstantsBase::calcMinCountPoT(size_t szof) {
@@ -33,3 +36,13 @@ size_t _PIContainerConstantsBase::calcMinCountPoT(size_t szof) {
 	// printf("calcMinCount sizeof = %d, min_count = %d, pot = %d\n", szof, elc, ret);
 	return ret;
 }
+
+
+size_t _PIContainerConstantsBase::calcMaxCountForPoT(size_t szof) {
+	return maxPoTAlloc / szof;
+}
+
+
+size_t _PIContainerConstantsBase::calcStepAfterPoT(size_t szof) {
+	return calcMaxCountForPoT(szof);
+}