all: yet more cleanups

Changes include:
  - use standard names for PE constants
  - add some more "noexcept"
  - improve upx_is_integral type-trait
  - introduce is_same_all and is_same_any type-traits
  - prepare TE-size checks in packer.h
  - CI updates

src/p_elf_enum.h

@@ -36,7 +36,7 @@
 
 #ifdef WANT_EHDR_ENUM
 #undef WANT_EHDR_ENUM
-    enum { // e_ident[]
+    enum { // indices for e_ident[16]
         EI_CLASS      = 4,
         EI_DATA       = 5,      /* Data encoding */
         EI_VERSION    = 6,
@@ -52,12 +52,15 @@
         ELFDATA2MSB = 2,        /* 2's complement, big endian */
     };
     enum { // e_ident[EI_OSABI]
-        ELFOSABI_NONE    = 0,      // == ELFOSABI_SYSV
+        ELFOSABI_NONE    = 0,   // == ELFOSABI_SYSV
         ELFOSABI_NETBSD  = 2,
         ELFOSABI_LINUX   = 3,
+        ELFOSABI_SOLARIS = 6,
+        ELFOSABI_AIX     = 7,
         ELFOSABI_FREEBSD = 9,
         ELFOSABI_OPENBSD = 12,
         ELFOSABI_ARM     = 97,
+        ELFOSABI_STANDALONE = 255 // Standalone (embedded) application
     };
     enum { // e_type
         ET_NONE = 0,            /* No file type */
@@ -67,15 +70,16 @@
         ET_CORE = 4,            /* Core file */
     };
     enum { // e_machine
-        EM_386    = 3,
+        EM_386    = 3,          // i386
         EM_MIPS   = 8,
-        EM_MIPS_RS3_LE = 10,    /* MIPS R3000 little-endian */
+        EM_MIPS_RS3_LE = 10,    // MIPS R3000 little-endian
         EM_PPC    = 20,
         EM_PPC64  = 21,
         EM_ARM    = 40,
-        EM_X86_64 = 62,
-        EM_AARCH64 = 183,
-
+        EM_X86_64 = 62,         // amd64
+        EM_AARCH64 = 183,       // arm64
+        EM_RISCV = 243,         // risc-v
+        EM_LOONGARCH = 258,
     };
     enum { // e_version
         EV_CURRENT = 1,
@@ -86,7 +90,7 @@
 #ifdef WANT_PHDR_ENUM
 #undef WANT_PHDR_ENUM
     enum { // p_type
-        PT_NULL    = 0,         /* Ingore: a "comment" */
+        PT_NULL    = 0,         /* Ignore: a "comment" */
         PT_LOAD    = 1,         /* Loadable program segment */
         PT_DYNAMIC = 2,         /* Dynamic linking information */
         PT_INTERP  = 3,         /* Name of program interpreter */
@@ -125,7 +129,7 @@
         SHT_FINI_ARRAY = 15,    /* Array of destructors */
         SHT_PREINIT_ARRAY = 16, /* Array of pre-constructors */
         SHT_GROUP = 17,         /* Section group */
-        SHT_SYMTAB_SHNDX = 18,  /* Extended section indeces */
+        SHT_SYMTAB_SHNDX = 18,  /* Extended section indices */
         SHT_GNU_LIBLIST = 0x6ffffff7, /* Prelink library list */
         SHT_GNU_HASH =  0x6ffffff6,   /* GNU-style hash table.  */