PIDeque fix ssize_t

fix uninitialized variables
fix PIDeque prepend with std::initializer_list

libs/main/containers/picontainers.cpp

@@ -20,11 +20,11 @@
 #include "picontainers.h"
 
 
-const ssize_t minAlloc = 64;
+const size_t minAlloc = 64;
 
 
-ssize_t _PIContainerConstantsBase::calcMinCountPoT(ssize_t szof) {
-	ssize_t ret = 0, elc = 1;
+size_t _PIContainerConstantsBase::calcMinCountPoT(size_t szof) {
+	size_t ret = 0, elc = 1;
 	while (elc * szof < minAlloc) {
 		elc *= 2;
 		++ret;